I searched the forums and couldn't find anyone that has provided feedback.

Is anyone running an upgraded polyurethane guibo? Is it worth upgrading for those who aren't concerned about NVH and want to minimize parasitic loss through the drive train? Is the difference between poly and rubber for the guibo significant/noticeable?

I'm asking because I'm about to upgrade to a CF driveshaft, and if I'm down there and it's worth it, I might as well swap the guibo as well.

How much power do you think you would gain? I doubt any. Those who have tried the revshift ones donít seem to like them. I know bmw used aluminum guibos with rubber inserts on some auto trans cars but I think the manual cars have all had rubber guibos.

There was a guy on here running it and he took it off. Lots of noise that got old fast.
There isn't a huge gain here, either. They don't really twist or anything.

That's exactly what I was thinking. I imagined the amount of actual "torque" that the guibo/flex disc/shit ass would be under is minimal if any. Doesn't make sense to spend $200 on almost non existent benefits.

Thanks for the answers guys, I appreciate it. I'll save that money for a track day instead.

I am running my 11 year old original
Guibo with my first version cf driveshaft. No issues. 100k miles. Probably 20k with the cf shaft. Tested to 150 mph. Plenty of full throttle runs. N/A with all
The bolt ons. No track, though. Track is the hardest on cars.